Thanks so much, Francine, Ank, Ardy, Jan, and Katie! I originally tried to draw a series of diminishing doorways, but it didn't look recognizable. Then I was going to leave it without the overlapping part, but decided it was too plain, so I added that. THEN, just as I was ready to post it, I realized that I had made the overlapping parts darker than the rest, and they didn't really "lift-up" from the puzzle, just sort of fade into it, so I switched the colors and made them the brighter ones. LOLOLOL! So NO ONE had better try putting mail into it, or he will be in BIG TROUBLE! :-))))